Earthquake · reviewed by a seismologist
M 1.7ml
20km NW of Progreso, B.C., MX
Yes. A magnitude 1.7 earthquake was recorded 20km NW of Progreso, B.C., MX, at 9:35 pm PDT on 23 September 2017 (04:35 UTC), 7.7 km deep.
- When
- Magnitude
- M 1.7 (ml)
- Depth
- 7.7 km below the surface
- Felt
- no reports yet
- Nearest
- Imperial County, 54 km NE
- Nearest mapped fault
- Yuha Basin faults, 6 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3304 days ago
Earthquake alerts for Seeley, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 9 km (6 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Seeley, El Centro, Heber, Calexico, Imperial.
How big was it?
This earthquake released about 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 100× the energy of this one
- This earthquake M 1.7 about 9.3 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
The largest earthquake within 50 km in our catalogue was M 4.0 on 2016-07-31 — about 3,600 times the energy of this one.
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 32.6913, -115.7547. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Imperial County, CA | 54 km (33 mi) | NE | earthquakes near Imperial County |
| San Diego County, CA | 102 km (64 mi) | WNW | earthquakes near San Diego County |
| Riverside County, CA | 118 km (73 mi) | N | earthquakes near Riverside County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
36 earthquakes have been recorded within 50 km since this one.
- 2.0 19km WNW of Progreso, B.C., MX
- 1.8 7km WSW of Calipatria, CA
- 1.8 17km NW of Ocotillo, CA
- 1.6 16km ENE of Ocotillo, CA
- 1.5 19km WNW of Progreso, B.C., MX
- 1.9 19km WNW of Progreso, B.C., MX
- 1.9 7km NNE of Imperial, CA
- 1.6 8km ENE of El Centro, CA
- 1.7 2km ESE of Westmorland, CA
- 1.8 3km E of Westmorland, CA
- 1.6 12km WNW of Progreso, B.C., MX
- 2.1 14km ESE of Ocotillo Wells, CA
- 2.1 8km SW of Progreso, B.C., MX
- 1.6 7km WSW of Holtville, CA
- 1.6 8km WSW of Holtville, CA
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.